You are missing the obJect relations from the BindToHierchicalCustomObject.aspx sample. In your case, you will need to use the outbound mode to define the object relations as detailed in the article "Outbound Mode" in the WebGrid documentations.

Attached is a simple sample of outbound mode scenario using LINQ object.

Glen,

Thanks for the reply, but if you look at my EDMCollection class I've actually implemented the ObjectRelations interface hence I thought I was already operating in "Inbound" mode.

However, I think I have got my app working with my own implementation while referencing your Tutorial Solution >> V4.0 >> Hierarchical_Binding.aspx tutorial.

Code below:

        protected void wgEDMPortfolios_InitializeDataSource(object sender, ISNet.WebUI.WebGrid.DataSourceEventArgs e)
        {
            List<BrokerEDMPortfolio> edmPorts2 = Controller.ServiceFacade.PortfolioNavigationService.GetBrokerEDMPortfolio(1752);

                        
            _edmColl = new EDMCollection(edmPorts2);
            e.DataSource = _edmColl;
        }

        protected void wgEDMPortfolios_PrepareDataBinding(object sender, ISNet.WebUI.WebGrid.DataSourceEventArgs e)
        {
            if (!IsPostBack)
            {
                wgEDMPortfolios.RetrieveHierarchicalStructure();
            }

        }

Glen,

Is it not possible at all to:

• Define the hierarchical grid structure client side
• use the concrete collection classes e.g. CustomerCollection, OrderCollection - which impletement IHierarchicalList and IObjectRelates
• Populate Parent collection class and all of its children
• Then bind the grid in the IntializeDataSource method like I did earlier and have the grid display correctly.

Hi Adrian,

    Yes, we can define the hierarchical grid structure in client side, however that is only for the design. With defining the hierarchical grid in client side, we do not need to use WebGrid1.RetrieveHierarchicalStructure() anymore since we have manually set the structure of WebGrid.

    However, when we use strong type custom object, we will need to define the binding itself for the Hierarchical WebGrid in PreInitialize server side event. In there, we will set the object relations for the parent and child table.

    I attached you a similar sample that my colleague provided to you but in mine, I use a List<> custom object for the data. Please kindly take a look and provide us with the feedbacks. Thank you and have a nice day.

Best Regards,

Andi Santoso